Shimomura, Nagano, Japan Historical Air Quality Analysis
Dive into detailed Air Quality Insights with historical data, monthly patterns, and yearly trends at your fingertips!
July Air Quality Analysis
Shimomura, Nagano, Japan
AQI Trends: Highest and Lowest
Same Day Analysis (1st July ):
On this day, AQI across the 5 years varied significantly: 2025 ranks 2nd highest AQI at 52 of Moderate air quality, showing improvement over 2022 on the same day.
Download 2024 Annual Data
World Air Quality Report

Day & Night AQI Trend: 2nd Jul - 3rd Jul 2025
Shimomura, Nagano, Japan
4 AM2nd Jul 2025
7 PM
3 AM3rd Jul 2025
AQI
AQI
52AQI
36AQI
In the last 24 hours,
Shimomura's AQI reached its highest point of 52 at 5 AM during the Night, while the lowest point, 36, was recorded at 7 PM during the Night between 2nd Jul and 3rd Jul 2025.
Day & Night AQI Trend : Jun - Jul 2025
Shimomura, Nagano, Japan
10°C8/14°C
15°C10/23°C
13°C3/23°C
16°C5/23°C
16°C7/26°C
15°C8/22°C
15°C9/22°C
17°C15/19°C
18°C14/20°C
16°C11/23°C
18°C11/25°C
16°C15/18°C
20°C18/24°C
21°C16/26°C
24°C18/31°C
22°C16/31°C
23°C17/31°C
22°C17/30°C
22°C16/30°C
22°C16/29°C
19°C17/21°C
19°C17/21°C
21°C17/26°C
21°C17/25°C
21°C16/27°C
21°C16/28°C
22°C16/30°C
23°C17/31°C
23°C18/29°C
0°C0/0°C
0°C0/0°C
42AQI
40AQI
41AQI
41AQI
2025 Days Vs Air Quality
Shimomura, Nagano, Japan
89%
162
11%
20
Total number of days with different AQI categories in last 183 days in 2025 (182 days remaining)
Under WHO’s Safe Air Quality Limits: 89%
Health Risk Level:
Low
In 2025, 89% of 183 days were within WHO’s safe air quality limits. The risk of health issues is Low, but the long-term effects, especially on vulnerable individuals, remain uncertain.
Annual Air Quality Insights
Shimomura, Nagano, Japan
AQI levels in 2025
Jan.
Feb.
Mar.
Apr.
May
Jun.
Jul.
Aug.
Sep.
Oct.
Nov.
Dec.
30AQI
30AQI
29AQI
28AQI
28AQI
31AQI
27AQI
26AQI
26AQI
24AQI
26AQI
28AQI
26AQI
29AQI
30AQI
25AQI
25AQI
25AQI
27AQI
35AQI
32AQI
37AQI
48AQI
52AQI
37AQI
35AQI
28AQI
29AQI
30AQI
28AQI
32AQI
45AQI
41AQI
43AQI
35AQI
36AQI
32AQI
35AQI
31AQI
30AQI
30AQI
31AQI
31AQI
32AQI
30AQI
31AQI
44AQI
39AQI
37AQI
33AQI
31AQI
31AQI
31AQI
32AQI
32AQI
34AQI
36AQI
44AQI
40AQI
41AQI
46AQI
37AQI
40AQI
34AQI
35AQI
35AQI
37AQI
36AQI
38AQI
36AQI
32AQI
41AQI
42AQI
39AQI
25AQI
22AQI
24AQI
19AQI
27AQI
42AQI
48AQI
58AQI
60AQI
73AQI
91AQI
69AQI
46AQI
38AQI
38AQI
33AQI
36AQI
24AQI
24AQI
22AQI
31AQI
24AQI
34AQI
41AQI
28AQI
45AQI
37AQI
46AQI
25AQI
31AQI
21AQI
29AQI
45AQI
53AQI
66AQI
54AQI
46AQI
48AQI
28AQI
30AQI
38AQI
44AQI
47AQI
44AQI
39AQI
53AQI
45AQI
33AQI
36AQI
36AQI
38AQI
28AQI
28AQI
34AQI
31AQI
26AQI
25AQI
26AQI
39AQI
43AQI
46AQI
47AQI
30AQI
43AQI
41AQI
62AQI
63AQI
54AQI
55AQI
47AQI
30AQI
31AQI
31AQI
30AQI
38AQI
24AQI
23AQI
23AQI
33AQI
22AQI
30AQI
35AQI
43AQI
45AQI
54AQI
55AQI
32AQI
30AQI
40AQI
48AQI
34AQI
27AQI
31AQI
37AQI
46AQI
50AQI
53AQI
51AQI
54AQI
38AQI
36AQI
33AQI
31AQI
38AQI
39AQI
44AQI
48AQI
52AQI
30AQI
35AQI
41AQI
38AQI
38AQI
39AQI
52AQI
No. of days
202537AQI
Highest AQI recorded in
July52AQI
Lowest AQI recorded in
January30AQI
202434AQI
Highest AQI recorded in
April48AQI
Lowest AQI recorded in
January26AQI
202337AQI
Highest AQI recorded in
July47AQI
Lowest AQI recorded in
December27AQI
202235AQI
Highest AQI recorded in
May43AQI
Lowest AQI recorded in
August24AQI
202130AQI
Highest AQI recorded in
June43AQI
Lowest AQI recorded in
January16AQI
202028AQI
Highest AQI recorded in
August53AQI
Lowest AQI recorded in
December16AQI
Most & Least Polluted Years Over the Last 6 Years
Shimomura's annual 2025 AQI (37) shows an average percentage change of 14.4% (worsened AQI) compared to previous years: 2020 (28), 2021 (30), 2022 (35), 2023 (37), 2024 (34).